Garudapurana 1.37

Glorious Garuḍa Mahāpurāṇa — 37
Hari said: / Gāyatrī is the supreme goddess, granting worldly enjoyment and liberation; / whoever recites her, even his greatest sins are destroyed.

I will declare the ritual procedure of Gāyatrī, which grants worldly enjoyment and liberation: / one should recite [her] a thousand and eight times, or eight hundred times.

Doing this at the three twilights, he attains the world of Brahman; having recited [her] a hundred times, he should drink water. / At twilight, having invoked the goddess who destroys all sins, he should worship [her]

with her own mantra, 'Bhūḥ bhuvaḥ svaḥ,' joined with the twelve names: / 'Homage to Gāyatrī; / homage, homage to Sāvitrī and to Sarasvatī;

and to the Mother of the Vedas, to Sāṃkṛtī, to Brahmāṇī, to Kauśikī in order, / to the virtuous one, to the accomplisher of all purposes, to the thousand-eyed one; and bhūḥ, bhuvaḥ,

svaḥ.' Thus one should offer firewood, clarified butter, and sacrificial food into the fire, / a thousand and eight times or eight hundred times with ghee,

for the accomplishment of dharma, pleasure, and the rest; one should offer in all rites. / Having worshipped an image made of sandalwood or gold,

a hundred thousand [recitations] should be chanted while eating milk, roots, and fruits. / By a fire offering of twenty thousand [oblations], one attains all desires.

[With the mantra:] 'Born on the northern peak, dwelling on the mountain on earth, / permitted by Brahmā, go, O goddess, at your pleasure.'

Thus ends the thirty-seventh chapter, titled 'Determination of the Ritual Procedure of Gāyatrī,' in the Conduct Section of the first part in the first section of the glorious Garuḍa Mahāpurāṇa.